84 Pete 359 n14 daycab can the seal

Hi guys,
Some know my situation...some dont
Short husband died. Need to move truck to new place. Got her going, she sat roughly 2 years. Drove her 2x around block . She sprung some coolant leaks. I expected something because a freeze plug popped out. But was not sure if it ever was in all the way or right. She looked new but didnt look brand new. Anyway oil cooler leaks. And a metal tube, well hoping it's just the tube.
Went to Peterbilt gave #s off of engine tag. He says no parts list comes up for motor. He said cummins is now involved, they should know not to panic .lol I am of course lol.
Looking at oil cooler it drips out of the bottom part of the end with 4 bolts. Looks like I could take bolts out put new seal.. it could be wishful thinking on my part . As I have never worked on one and am quit clueless on it. I also get treated like a woman at peterbilt. Which is fine because I am. But can someone tell if It possible to just change seal or do I have to buy new oil cooler. ? I prefer changing seal if possible. Cost wise. I am willing to learn how to change it. Peterbilt said it was too hard for me. I say they just dont know me .lol I will order a couple and try again if its ruined first try. If I cant do it , I'll get someone who can.

Yes I see rust, so I will take her to get cleaned out.

 

Thank you. Hubby said n14. I am getting a crash course on these. Lol
I will give that a try. Thank you so much.

 

Thank you. I feel lost . My husband worked on it. I put a clutch in with him once. He wasnt fun to turn a wrench with at all. So I didnt get to learn anything on the trucks. I regret that. Now's my chance. Unfortunately I'm on a timeline moving . So I'm jumping in blind and treading water in a man's pond. I cant find a reliable mechanic to come out and just make her road worthy to new home. Once in her new home. I'll take my time learning her ins and outside. Shes got a 2 story shop. Its huge. No more camping outside for her. Just need to get her there lol.
She has another leak. Unknown where. But the metal tube is wet. The bottom one on drivers side. I believe it's coming from the higher side.
hoping it can be tightened. Have not looked hard on that one yet. Been stressed over other leak.
Then after these leaks I hear air in dash at trailer parking brake knobs and far back by drivers side. I want to say it's a brake thingy. But I'm only taking on 1 leak at a time.

 

Peterbilt just called. Thank you for your info. I corrected the motor before he could. He sounded shocked. I still ate a little teasing. I deserved. Your info saved me a lot !! Thank you. I was able to look a little more intelligent . They quoted about $460 to replace and refill . With myself doing the work.
I said first I'm checking the plug above .lol

 

Thank you. Yeah it's tough to explain. I understand. I can work on my dodge cummins. Now have a ford. Very foreign to me. Then now the pete. It's a crash course. I would pay someone but I cant find a reliable mechanic. The peterbilt mechanic is not very nice to me. Parts guy is great. I dont want their mechanic . Plus I cant get her there yet. Dropping the amount of coolant she is. I appreciate the info. When I get the coolant leaks stopped. I'll start learning the air system. Unless I find a mechanic . Thanks again